CN1619995A - Method of realizing series monitoring static charge error code calibration value compensation underthrust and its device - Google Patents

Abstract

The invention relates to a method and a device for realizing the compensating down-insertion of the code error check value of the cascade monitoring static payload. The present invention adopts corresponding registers to save the parameters required for TCM-B3 compensation and interpolation, and calculates the actual TCM-B3 compensation value according to the saved parameters, and finally, inserts the calculated TCM-B3 compensation value into the data B3 bytes in the stream. The realization of the present invention makes it possible to realize the compensating and down-inserting processing of the tandem monitoring static load error check value in the network communication relatively easily; moreover, the present invention also carries out the corresponding compensation and down-inserting formula defined in the protocol Processing, so that the corresponding TCM-B3 compensation down-insertion processing can be realized under the condition of occupying less chip resources. The invention provides corresponding technical support for accurately locating the section where the code error occurs in the communication network.

Description

Method and device for realizing compensation and interpolation of code error check value of serial monitoring static load

technical field

The invention relates to the technical field of network communication, and in particular to a method and a device for realizing the compensatory down-insertion of the code error check value of serial monitoring payload.

Background technique

In network communication, the TCM (Tandem Monitoring) module is mainly used in a multi-operator network environment to locate the section where bit errors occur, and, as shown in Figure 1, in the network, to accurately locate the bit error occurred Section, it is necessary to set TCM-SOURCE (the source of serial monitoring) and TCM-SINK (the terminal of serial monitoring) in pairs. Its working principle is to monitor a certain section of network through paired TCM-SOURCE and TCM-SINK, so as to determine the working condition of this section of network. Specifically, in TCM-SOURCE, the data of the current frame is XORed to obtain the B3 (static load error check value) of the frame data, and the result is inserted into the next frame data; in TCM-SINK, it is re-used The above XOR calculation method calculates the B3 of the corresponding received data frame, and compares the recalculated B3 with the B3 in the next frame of data, so as to determine whether there is a bit error in this segment of network transmission, specifically, if If the two values are the same, there is no bit error, otherwise there is a bit error.

Usually a frame of data transmitted in the network includes B3 of the previous frame of data and N1 bytes for recording B3 error codes (N1 bytes record error codes and alarm monitoring values), and the B3 error codes are based on the above The actual B3 of one frame of data and the XOR operation result of B3 calculated according to the received last frame of data are obtained, and the N1 byte of recording B3 error bit needs to be inserted into the current frame data, as shown in Figure 2 As shown, because B3 of the current frame (ie Frame N) needs to be inserted into the next frame (ie Frame N+1), and B3 of the current frame is the result of the XOR operation of the data of the current frame, so that each time N1 The down-interpolation will change the actual B3 of the current frame data. Therefore, in order to ensure that the B3 of the current frame data inserted in the next frame remains unchanged, it is necessary to compensate B3 and insert it into the next frame data, that is, the so-called TCM-B3 (tandem monitoring payload error check value) compensates for the down-insertion operation.

The compensation calculation formula used to compensate for the insertion of the next frame B3 has been defined by the G.707 protocol, specifically: B3'(t)=B3(t-1)B3'(t-1)N1(t- 1)N'(t-1)B3(t);

in:

B3 represents the value of the B3 byte in the original data stream;

B3' indicates the value of the B3 byte after the compensation is determined;

N1 represents the value of the N1 byte in the original data stream (that is, the original value of the error code and alarm monitoring value);

N1' represents the updated N1 byte value (that is, the new value of the error code and the alarm monitoring value after the new B3 error code is recorded);

 represents a bit XOR operation;

t represents the current frame time;

t-1 represents the moment of the previous frame.

Although the protocol has defined the calculation formula of compensation down-interpolation, since this technology has not been applied in communication equipment, there is no specific implementation scheme for performing compensation down-interpolation processing on TCM-B3.

Contents of the invention

The purpose of the present invention is to provide a method and device for realizing compensation and interpolation of code error check value of serial monitoring payload, so that the corresponding compensation and interpolation processing of TCM-B3 can be realized relatively simply.

The purpose of the present invention is achieved through the following technical solutions:

The present invention firstly provides a method for compensating and interpolating the code error check value of static payloads in serial monitoring, including:

A. Record the static payload error check value in the received last frame of data and the actually inserted static payload error check value, as well as the original value and new value of the error code and alarm monitoring value of the previous frame of data;

B. When the current frame data arrives, obtain the static payload error check value in the current frame data, and compare it with the static payload error check value in the recorded previous frame data and the actual down-interpolated static payload error check value. Code check value, as well as the original value and new value of the bit error and alarm monitoring value of the previous frame of data to perform XOR operation;

C. Insert the result obtained by the XOR operation into the payload error check value byte of the current frame as the serial monitoring static payload error check value.

In the method for realizing serial connection monitoring static load error check value compensation and interpolation of the present invention:

Described step A comprises:

Record the XOR operation result of the static payload error check value in the received last frame of data and the actual down-interpolated static payload error check value, that is, the intermediate value of the static payload error check value compensation, and the previous frame The original value and new value of data bit error and alarm monitoring value;

And the step B includes:

When a new frame of data arrives, the original value and new value of the error and alarm monitoring value of the corresponding previous frame of data are obtained, and the stored static error check value of the previous frame is also called to compensate the intermediate value, and the An XOR operation is performed on each value, and then, an XOR operation is performed on the compensation intermediate value of the payload error check value of the current frame obtained by the XOR operation and the static payload error check value of the current frame.

The present invention also provides a device based on the above-mentioned method to realize the compensation and interpolation of the static load error code check value of serial monitoring, including:

The static payload error check value register in the input data, the static payload error check value register after compensation, the error code and alarm monitoring value register of the input data, the generated new code error and alarm monitoring value register and the exception or operation module;

When a new frame of data arrives, call the error code and alarm monitoring value of the previous frame saved in the error code and alarm monitoring value register of the input data, and call the generated new code error and alarm monitoring value register saved in the previous frame. The error and alarm monitoring value of one frame, and the static payload error checking value of the previous frame is called out from the static payload error checking value register of the input data and the compensated static payload error checking value register respectively and static payload error check value compensation value; then, each value and the static payload error check value of the current frame are subjected to XOR operation processing through the exclusive OR operation module, and finally the calculated static payload error check value The compensation value is inserted into the payload error check value byte of the current frame.

Each of the above-mentioned registers is the corresponding data value stored in the refresh register when a new frame of data arrives.

The present invention also provides a device based on the above-mentioned method to realize the compensation and interpolation of the static load error code check value of serial monitoring, including:

Static load error check value compensation intermediate value register, used to save the static load error check value compensation intermediate value, and the error code and alarm monitoring value register of the input data, the new generated code error and alarm monitoring value register and XOR operation module;

When a new frame arrives, call the static load error check value compensation intermediate value of the previous frame in the static load error check value compensation intermediate value register, and the error code and alarm monitoring value register of the input data, the generated The original value and the new value of the error and alarm monitoring value of the current frame in the new error and alarm monitoring value register, and each value is subjected to an exclusive OR operation through the exclusive OR operation module, and then the new value obtained by the exclusive OR operation XOR the intermediate value of static payload error check value compensation with the static payload error check value of the current frame to obtain the actual static payload error check value compensation value of the current frame, and calculate the actual static payload error check value The value compensation value is inserted into the payload error check value byte of the current frame.

The B3 compensation intermediate value register is connected with a new service indication signal, and the B3 compensation intermediate value registered therein is cleared each time a new service arrives.

The realization of the present invention makes it possible to realize the compensating and down-inserting processing of the tandem monitoring static payload error check value in the network communication relatively easily; moreover, the present invention also carries out the corresponding compensation and down-inserting formula defined in the protocol processing, so that the corresponding TCM-B3 compensation down-insertion processing can be realized in the case of occupying less chip resources. The invention provides corresponding technical support for accurately locating the section where the code error occurs in the communication network.

Description of drawings

FIG. 1 is a schematic diagram of a network structure for implementing TCM;

FIG. 2 is a schematic diagram of the principle of the corresponding B3 bit error value of the TCM in the prior art;

Fig. 3 is a schematic structural view 1 of the device of the present invention;

Fig. 4 is a schematic structural diagram 2 of the device of the present invention.

Detailed ways

The specific implementation of the method and device for implementing serial connection monitoring static load error check value compensation and interpolation of the present invention is shown in the figure, and the specific description is as follows:

Method of the present invention comprises: at first determine the B3 (t) value in the current frame (being Frame N frame) that receives; Alarm monitoring value original value and new value N1(t-1), N1'(t-1), and static payload error check value B3(t-1) value and static payload error check value after compensation B3'(t-1) value; finally, XOR operation is performed on each value according to the compensation interpolation formula specified in the agreement, and the required TCM-B3 compensation interpolation value B3'(t) is obtained, and the B3 '(t) down-insert into the B3 byte of the current frame, so as to realize the operation of TCM-B3 compensation down-insertion.

Based on the above method, the present invention provides a device, as shown in Figure 3, its structure includes the B3 register in the input data, the B3 register after compensation, and the N1 value register of the input data (that is, the bit error and alarm of the input data monitoring value register), the generated new N1 value register (that is, the generated new error code and alarm monitoring value register) and the XOR operation module; when a new frame of data arrives, call the N1 value register of the input data to save The N1(t-1) value of the previous frame, call the N1'(t-1) value of the previous frame saved in the new N1 value register generated, and from the B3 register of the input data and the compensated B3 register respectively call out the B3(t-1) and B3'(t-1) values of the previous frame; then, the corresponding N1(t-1) value, N1'(t-1) value, B3(t-1) 1), the B3'(t-1) value and the B3(t) value of the current frame are processed through the XOR operation module, and the calculation result is the compensation of the tandem monitoring static payload error check value required by the present invention Value, that is, the actual down-inserted tandem monitoring payload error check value, and finally the calculated actual down-inserted TCM-B3 is inserted into the B3 byte of the current frame, thus realizing the compensation of TCM-B3 insert operation.

The present invention also provides another implementation scheme, wherein the principle of the method is to simultaneously XOR B3(t) on both sides of the compensation calculation formula stipulated in the above agreement to obtain the following formula:

B3'(t)B3(t)=B3(t-1)B3'(t-1)N1(t-1)N'(t-1);

And define A(t)=B3'(t)B3(t), so the above formula can be expressed as:

A(t)=A(t-1)N1(t-1)N1'(t-1);

Among them, A(t) is the intermediate value of B3 compensation we need, and it is XORed with the input B3(t) to obtain the actual B3 value interpolated. As follows:

B3'(t)=B3(t)A(t)

At the same time, I can easily deduce that the initial value of the B3 compensation value is as follows:

A(0)=B3'(0)B3(0)=0

Based on the above principles, the method of the present invention is: when a new frame arrives, obtain the original value N1(t-1) and the new value N1'(t-1) of the error code and alarm monitoring value of the corresponding previous frame ), and at the same time call the saved B3 compensation intermediate value A(t-1) of the previous frame, and perform XOR operation on N1(t-1), N1'(t-1) and A(t-1) values , so as to obtain the B3 compensation intermediate value A(t) of the current frame, and finally, use the B3(t) value of the current frame and the B3 compensation intermediate value A(t) to perform an XOR operation to obtain the corresponding B3 of the current frame Compensation value B3'(t), B3'(t) is inserted into the current frame, so as to realize the operation of TCM-B3 compensation and down-interpolation.

Based on the above-mentioned method of the present invention, the device of the present invention, as shown in Figure 4, constructs an 8-bit B3 compensation intermediate value register with an initial value of 0, and the B3 compensation intermediate value register is used to save the B3 compensation intermediate Value, when a new frame arrives, call the B3 compensation intermediate value A(t-1) of the previous frame, and combine it with the error code and alarm monitoring value register of the input data and the generated new code error and alarm monitoring value register Exclusive OR operation results of the original value and new value (ie N1(t-1) value and N1'(t-1) value) of the stored error and alarm monitoring value of the previous frame are then XORed to obtain a new B3 compensation The intermediate value A(t), and then XOR the B3 value B3(t) of the current frame with the newly obtained B3 compensation intermediate value A(t) to obtain the actual B3 compensation interpolation value B3'(t) of the current frame (that is, the B3 compensation value), and finally, down-interpolate the calculated B3 compensation down-interpolation into the B3 byte of the current frame. Moreover, the B3 compensation intermediate value register of the present invention is also connected with a new business indication signal, and when a new business arrives each time, the B3 compensation intermediate value registered therein is cleared under the action of the new business indication signal, so that new The corresponding TCM-B3 compensation down-insertion processing of the business is not affected by the B3 compensation intermediate value of the original business stored therein.

In the present invention, except for the B3 compensation intermediate value register, all other registers refresh the corresponding data values stored in the registers when a new frame of data arrives.

It can be seen from the above description that, compared with the first solution, the second solution provided by the present invention saves the number of registers used and corresponding chip resources.

Therefore, the present invention not only provides a method and device for compensating and interpolating the code error check value of static payloads in series monitoring, but also ensures that the provided method and device are relatively simple and reasonable to implement.

Claims (6)

1, a kind of method that realizes that the compensation of tandem connection monitor static charge error code check value is inserted down is characterized in that comprising:

Static charge error code check value in the previous frame data of A, recorder and the actual static charge error code check value of inserting down, and the error code of previous frame data and alarm monitoring value initial value and new value;

B, when current frame data arrives, obtain the static charge error code check value in the current frame data, and with its with the previous frame data of record in static charge error code check value, the actual static charge error code check value of inserting down, and the error code of previous frame data and alarm monitoring value initial value and new value are carried out XOR;

C, result that XOR is obtained are as in the static charge error code check value byte that inserts in present frame under the tandem connection monitor static charge error code check value.

2, the slotting down method of realization tandem connection monitor static charge error code check value compensation according to claim 1 is characterized in that:

Described steps A comprises:

Static charge error code check value in the previous frame data of recorder and the actual XOR result of slotting static charge error code check value down, i.e. static charge error code check value compensation median, and the error code of previous frame data and alarm monitoring value initial value and new value;

And described step B comprises:

When new frame data arrive, obtain error code and the alarm monitoring value initial value and the new value of corresponding previous frame data, also call the static charge error code check value compensation median of the previous frame of preservation simultaneously, and each value carried out XOR, then, utilize the static charge error code check value compensation median of the present frame that XOR obtains and the static charge error code check value of present frame to carry out XOR.

3, a kind of device of inserting down based on the realization tandem connection monitor static charge error code check value compensation of said method is characterized in that comprising:

The static charge error code check value register of input in the data, the static charge error code check value register after the compensation, and new error code and the alarm monitoring value register and the XOR module of the error code of input data and alarm monitoring value register, generation;

When new frame data arrive, call the error code and the alarm monitoring value of the previous frame of preserving in input error code of data and the alarm monitoring value register, call the error code and the alarm monitoring value of the previous frame of preserving in the new error code of generation and the alarm monitoring value register, and from the static charge error code check value register of input data and the static charge error code check value register after the compensation, access the static charge error code check value and the static charge error code check value offset of previous frame respectively; Then, the static charge error code check value of each value and present frame is carried out XOR by the XOR module handle, will calculate the static charge error code check value byte that inserts in present frame under the static charge error code check value offset of acquisition at last.

4, the slotting down device of realization tandem connection monitor static charge error code check value compensation according to claim 3 is characterized in that described each register is when new frame data arrive, and refreshes the corresponding data values that register is deposited.

5, a kind of device of inserting down based on the realization tandem connection monitor static charge error code check value compensation of said method is characterized in that comprising:

Static charge error code check value compensation median register is used to preserve static charge error code check value compensation median, and new error code and the alarm monitoring value register and the XOR module of the error code of input data and alarm monitoring value register, generation;

When a new frame arrives, call the static charge error code check value compensation median of the previous frame in the static charge error code check value compensation median register, and the error code and the alarm monitoring value register of input data, the new error code that generates and the error code of the present frame in the alarm monitoring value register and alarm monitoring value initial value and new value, and each value carried out XOR by the XOR module, the new static charge error code check value compensation median that then again XOR is obtained and the static charge error code check value XOR of present frame obtain the actual static charge error code check value offset of present frame, and insert in the static charge error code check value byte of present frame under the actual static charge error code check value offset that will calculate.

6, the slotting down device of realization tandem connection monitor static charge error code check value compensation according to claim 5, it is characterized in that described B3 compensation median register is connected with the new business index signal, when having new business to arrive, remove the B3 compensation median of wherein depositing at every turn.